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Usage: Overview

Table 1: User statistics
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
171,032 159,384 28% 36% 24% 11% 24,968 94% 4% 2% 1%
- Simulation Users 5
9,175 3,513 48% 26% 17% 8% 3,555 91% 5% 1% 3%
- Interactive Users 6
40,126 37,530 36% 34% 19% 11% 7,132 94% 4% 2% 0%
- Download Users 7
153,431 152,160 29% 36% 24% 11% 20,533 95% 3% 2% 0%
Total Users (old defn) 8
49,307 - - - - - - - - - -
Table 2: Simulation Usage
Simulation Users 5 9,175 users
Simulation Runs 289,471 jobs
Total CPU Time 7,176 days  
Total Wall Time 25,588 days  
Total Interaction Time 4,720 days  
Users with > 10 mins of CPU Time 2,230 users  
Avg. Number of Simulation Runs/User 32 jobs  
Avg. Time between First and Last Simulation 2,170 days  
Repeat Users with > 10 Simulation Jobs 4,321 users  
Repeat Users with > 3 Months 9 2,280 users  
Table 3: Miscellaneous Statistics
Domains Served 12,236
Cummulative Interactive User Sessions 10 105,386
Cummulative Session Time 4,694 days
Visitors 11 355,775
Visits 12 903,273
New Accounts 9,319
Max User Logins 644 users on 2013-02-20
Web Server Hits 59,533,146
Table 4: Collaboration Usage
Shared Tool Sessions 13 70
New tools under development 29
Table 5: User statistics by registered/unregistered
Users Totals Residence Organization
Identified US Asia Europe Other Identified Edu. Ind. Gov. Other
Total Users 1
171,032 159,384 28% 36% 24% 11% 24,968 94% 4% 2% 1%
- Registered Users 2
15,383 4,980 46% 28% 17% 9% 5,047 89% 6% 1% 4%
- Unregistered Interactive Users 3
20,559 19,752 29% 38% 23% 11% 2,748 94% 4% 2% 0%
- Unregistered Download Users 4
135,090 134,652 28% 36% 25% 11% 17,173 95% 3% 2% 0%
  1. Sum of Registered Users2, Unregistered Interactive Users3 and Unregistered Download Users4
  2. Number of Users that logged in. User registration assigns a unique login to each individual user.
  3. Number of Unregistered Users, identified by unique hosts/IPs, that had an active Session 10 without logging in. Does not include known web bots/crawlers.
  4. Number of Unregistered users, identified by unique hosts/IPs, that had an active session of less than 15 minutes without logging in and downloaded a non-interactive resource such as PDF or podcast. Does not include web bots/crawlers.
  5. Number of Registered Users2 that ran one or more simulation runs.
  6. All Unregistered Users, identified by unique hosts/IPs, that had an active Session 10. Does not include known web bots/crawlers.
  7. All Unregistered users, identified by unique hosts/IPs that downloaded a non-interactive resource such as PDF or podcast. Does not include known web bots/crawlers.
  8. Sum of Simulation Users 5 + Unregistered Interactive Users 3 including web bots/crawlers.
  9. Number of Simulation users that returned after a gap of 3 months.
  10. Begins when an IP is active on the site for at least 15 minutes. Ends when inactive for more than 30 minutes, including time spent viewing videos.
  11. Identified by a unique IP address / hostname.
  12. Based on MIT OCW metric of Visits: A visit is activity by a unique visitor delimitated by a 30 minute absence from the site on either side of the activity.
    These visits correspond to unique visitors 11. Does not include known web bots/crawlers
  13. Number of Simulation sessions that were shared between 2 or more users.

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